Studying the fruit fly, a household nuisance but a time-

**Studying the fruit fly, a household nuisance but a time-honored experimental subject, has enabled the secrets of how embryos develop to begin to be unraveled by scientists**.A. Studying the fruit fly, a household nuisance but a time-honored experimental subject, has enabled the secrets of how embryos develop to begin to be unraveled by scientists.B. By the study of the fruit fly, a household nuisance and also a time honored experimental subject, it was possible for the secrets of how embryos develo0p to begin to be unraveled by scientists.C. By studying a household nuisance but a time-honored experimental subject, the fruit fly enabled scientists to begin to unravel the secrets of how embryos develop.D. By studying the fruit fly, a household nuisance and also a time-honored experimental subject, the secrets of how embryos develop are beginning to be unraveled by scientists.E. The study of the fruit fly, a household nuisance but a time-honored experimental subject, has enabled scientists to begin to unravel the secrets of how embryos develop.

EPetterd

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Eccentric Seedy "the secrets" do not study the "fruit fly" and that's what the problem is with choice D. Also the secrets themselves cannot begin to get unraveled by someone. It is important to understand whose intrinsic ability is it to unravel "scientists" or "secrets" :)?